ANALYSIS OF DIFFERENTIAL PULSE CODE MODULATION WITH FORWARD ADAPTIVE LLOYD-MAX'S QUANTIZER FOR LOW BIT-RATE SPEECH CODING

作者：Peric Zoran^*; Jocic Aleksandar; Nikolic Jelena; Velimirovic Lazar; Denic Dragan

来源：Revue Roumaine des Sciences Techniques-Serie Electrotechnique et Energetique, 2013, 58(4): 424-434.

• Differential pulse code modulation (DPCM)
• Lloyd-Max's quantizer
• Forward adaptation
• Predictor
• Correlation coefficient
• Prediction gain
• Signal to quantization noise ratio

In this paper, a DPCM (Differential Pulse Code Modulation) system with forward adaptive Lloyd-Max's quantizer is presented. This quantizer is designed for low bit rate, where the first and the second order linear predictors are used in the,proposed DPCM system solution. It is shown how SQNR (Signal to Quantization Noise Ratio) and Gp (Prediction Gain) depend on the correlation coefficients of the predictor of the first and the second order. The obtained experimental values of parameters SQNR and are presented and compared with the corresponding theoretical values for the given system. In this manner the selection of optimal DPCM system correlation coefficients values is performed and the possibilities of this DPCM system application in the speech coding are indicated.

• 出版日期2013-12